Question: Pls help on all asked. 27. It is found that a certain brand of light bulbs has a lifetime of 215 hours with a standard

Pls help on all asked.

27. It is found that a certain brand of light bulbs has a lifetime of 215 hours with a standard deviation of 12 hours. If the lifetime of the bulbs is assumed to be normally distributed, what percentage would you expect A. to fail in less than 200 hours? Answer as a percentage to 2 decimal places. B. To have a lifetime of more than 250 hours? C. Do you think the company producing these light bulbs should be concerned about their reliability? Explain why or why not

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